Compilare: user.cpp: In function ‘int main()’: user.cpp:81:15: warning: unused variable ‘m’ [-Wunused-variable] int n, q, m, i, j, t, x, y; ^ user.cpp:78:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "qvect.in", "r", stdin ); ^ user.cpp:79:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "qvect.out", "w", stdout ); ^ user.cpp:83:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n, &q ); ^ user.cpp:87:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &mat[i][0] ); ^ user.cpp:90:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &mat[i][j] ); ^ user.cpp:95:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d", &t, &x, &y ); ^ user.cpp: In function ‘int med(int, int)’: user.cpp:46:17: warning: ‘z’ may be used uninitialized in this function [-Wmaybe-uninitialized] int k=0, m, z, i; ^